OMG They're adorable!!! Where'd you get them from? Gorgeous tiels!!! Are they hand-tame? Were they hand fed? *swoons* I wub them!

How large is the cage? Just from guesstimating, I think that cage is only sufficient for two tiels. It looks quite large, so I suppose you could cram a third tiel in there, but you'd have to let the birds out frequently. Unlike Budgies and Finches, Tiels are generally not flappers/hoppers and don't require a lot of flying space (they make your bedroom their flying space ).

Edit: I researched budgie mutations awhile back and dabbled in cockatiel mutations. From my limited knowledge, Cinnamon only dilutes the gray, but does not affect other melanin. So, from the Cinnie's pictures, I'd say you've got youself an Allie